As I'm coming off my first season burning wood in my F600, I was thinking about how different it is to heat in the shoulder season. Starting, stopping, starting, stopping etc. I just dropped one of my kids off at the bus stop and came thru the downstairs (bi-level home) to check the fire I started a couple of hours earlier. The temp was in the low 400 range (never got above 550 all season). I went to turn the air down to get my traditional temp increase to 475 and the air controller wouldn't move. I opened the side door to see if there were coals around the air opening that may have found there way into the mechanism. I cleared a few coals away and heard a low bang. It sounded like someone banged a beer bottle on a table. Upon further examination, I noticed a perfectly vertical crack slightly to the right of the ash pan handle and above the ash lip. It's on the frame just below the doors. I'M #$%^#!# MAD I hope my dealer doesn't give me any crap. I never got this stove above 550 all season and he knows that. I went there at least twice for advice about how to get more heat. I paid the dealer $6,000 for the stove, hearth and SS chimney. If I get anything but pristine customer service I'll explode. SERENITY NOW! Anybody care to comment or provide words of calming to me???? Is it still safe to run till it gets repaired? I have a CO detector near the stove that is at zero right now.